HT1621BQ

{
  "schema_version": 1,
  "type": "component",
  "slug": "ht1621bq",
  "title": "HT1621BQ",
  "brief": "HGSEMI LCD Drivers, LQFP-48(7x7). Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "led-drv",
    "ht1621bq"
  ],
  "component": {
    "mpn": "HT1621BQ",
    "manufacturer": "HGSEMI",
    "package": "LQFP-48(7x7)",
    "pin_count": 48,
    "category": "LED-drv",
    "subcategory": "LCD Drivers",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/b23936df03793bbc58e03a9c4cff9dae.pdf",
    "parts": {
      "symbol": "ht1621bq.kicad_sym",
      "footprint": "ht1621bq.kicad_mod",
      "model_3d": "ht1621bq-etched.glb",
      "model_3d_plain": "ht1621bq.glb",
      "model_3d_step": "ht1621bq-etched.step",
      "model_3d_step_plain": "ht1621bq.step",
      "lbr": "ht1621bq.lbr"
    },
    "distributor_links": {
      "lcsc": "C910856"
    },
    "pins": [
      {
        "number": "1",
        "name": "/CS",
        "type": "input",
        "description": "Chip-select input, active low, with internal pull-up. When /CS is high, data/command transfers are inhibited and the serial interface is reset. When /CS is low, the host can transfer data and commands."
      },
      {
        "number": "2",
        "name": "/RD",
        "type": "input",
        "description": "READ clock input with internal pull-up. RAM data is shifted out onto DATA on the falling edge of /RD; the host latches the data on the following rising edge."
      },
      {
        "number": "3",
        "name": "/WR",
        "type": "input",
        "description": "WRITE clock input with internal pull-up. Data on DATA is latched into the HT1621B on the rising edge of /WR."
      },
      {
        "number": "4",
        "name": "DATA",
        "type": "bidirectional",
        "description": "Serial data I/O for addresses, commands, and RAM data, with internal pull-up. Driven by the host during writes/commands and by the HT1621B during reads."
      },
      {
        "number": "5",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground reference (0 V)."
      },
      {
        "number": "6",
        "name": "OSCO",
        "type": "output",
        "description": "Crystal / external clock oscillator output. Connect a 32.768 kHz crystal between OSCI and OSCO, or leave OSCO floating when using the internal 256 kHz RC oscillator or an external clock on OSCI."
      },
      {
        "number": "7",
        "name": "OSCI",
        "type": "input",
        "description": "Crystal / external clock input. Connects to a 32.768 kHz crystal (with OSCO) or accepts an external 256 kHz clock; leave floating if the internal RC oscillator is used."
      },
      {
        "number": "8",
        "name": "VLCD",
        "type": "power_in",
        "description": "LCD bias-voltage input. Sets the LCD drive amplitude; VLCD must be less than or equal to VDD."
      },
      {
        "number": "9",
        "name": "VDD",
        "type": "power_in",
        "description": "Main supply, 2.4 V to 5.2 V."
      },
      {
        "number": "10",
        "name": "/IRQ",
        "type": "output",
        "description": "Time base / WDT overflow flag output, N-channel open-drain. Requires an external pull-up to VDD; goes low on overflow after IRQ_EN."
      },
      {
        "number": "11",
        "name": "/BZ",
        "type": "output",
        "description": "Complementary buzzer drive output. Provides an anti-phase 2 kHz or 4 kHz square wave (selected by TONE2k/TONE4k, enabled by TONE ON) for driving a piezo buzzer differentially with BZ."
      },
      {
        "number": "12",
        "name": "BZ",
        "type": "output",
        "description": "Buzzer drive output. Provides a 2 kHz or 4 kHz square wave (selected by TONE2k/TONE4k, enabled by TONE ON) for driving a piezo buzzer differentially with /BZ."
      },
      {
        "number": "13",
        "name": "COM0",
        "type": "output",
        "description": "LCD common (backplane) driver output 0."
      },
      {
        "number": "14",
        "name": "COM1",
        "type": "output",
        "description": "LCD common (backplane) driver output 1."
      },
      {
        "number": "15",
        "name": "COM2",
        "type": "output",
        "description": "LCD common (backplane) driver output 2."
      },
      {
        "number": "16",
        "name": "COM3",
        "type": "output",
        "description": "LCD common (backplane) driver output 3."
      },
      {
        "number": "17",
        "name": "SEG31",
        "type": "output",
        "description": "LCD segment driver output 31."
      },
      {
        "number": "18",
        "name": "SEG30",
        "type": "output",
        "description": "LCD segment driver output 30."
      },
      {
        "number": "19",
        "name": "SEG29",
        "type": "output",
        "description": "LCD segment driver output 29."
      },
      {
        "number": "20",
        "name": "SEG28",
        "type": "output",
        "description": "LCD segment driver output 28. Datasheet notes that on the 48-pin LQFP the SEG27/SEG28 pin ordering is non-standard; verify against silkscreen before layout."
      },
      {
        "number": "21",
        "name": "SEG27",
        "type": "output",
        "description": "LCD segment driver output 27. Datasheet notes that on the 48-pin LQFP the SEG27/SEG28 pin ordering is non-standard; verify against silkscreen before layout."
      },
      {
        "number": "22",
        "name": "SEG26",
        "type": "output",
        "description": "LCD segment driver output 26."
      },
      {
        "number": "23",
        "name": "SEG25",
        "type": "output",
        "description": "LCD segment driver output 25."
      },
      {
        "number": "24",
        "name": "SEG24",
        "type": "output",
        "description": "LCD segment driver output 24."
      },
      {
        "number": "25",
        "name": "SEG23",
        "type": "output",
        "description": "LCD segment driver output 23."
      },
      {
        "number": "26",
        "name": "SEG22",
        "type": "output",
        "description": "LCD segment driver output 22."
      },
      {
        "number": "27",
        "name": "SEG21",
        "type": "output",
        "description": "LCD segment driver output 21."
      },
      {
        "number": "28",
        "name": "SEG20",
        "type": "output",
        "description": "LCD segment driver output 20."
      },
      {
        "number": "29",
        "name": "SEG19",
        "type": "output",
        "description": "LCD segment driver output 19."
      },
      {
        "number": "30",
        "name": "SEG18",
        "type": "output",
        "description": "LCD segment driver output 18."
      },
      {
        "number": "31",
        "name": "SEG17",
        "type": "output",
        "description": "LCD segment driver output 17."
      },
      {
        "number": "32",
        "name": "SEG16",
        "type": "output",
        "description": "LCD segment driver output 16."
      },
      {
        "number": "33",
        "name": "SEG15",
        "type": "output",
        "description": "LCD segment driver output 15."
      },
      {
        "number": "34",
        "name": "SEG14",
        "type": "output",
        "description": "LCD segment driver output 14."
      },
      {
        "number": "35",
        "name": "SEG13",
        "type": "output",
        "description": "LCD segment driver output 13."
      },
      {
        "number": "36",
        "name": "SEG12",
        "type": "output",
        "description": "LCD segment driver output 12."
      },
      {
        "number": "37",
        "name": "SEG11",
        "type": "output",
        "description": "LCD segment driver output 11."
      },
      {
        "number": "38",
        "name": "SEG10",
        "type": "output",
        "description": "LCD segment driver output 10."
      },
      {
        "number": "39",
        "name": "SEG9",
        "type": "output",
        "description": "LCD segment driver output 9."
      },
      {
        "number": "40",
        "name": "SEG8",
        "type": "output",
        "description": "LCD segment driver output 8."
      },
      {
        "number": "41",
        "name": "SEG7",
        "type": "output",
        "description": "LCD segment driver output 7."
      },
      {
        "number": "42",
        "name": "SEG6",
        "type": "output",
        "description": "LCD segment driver output 6."
      },
      {
        "number": "43",
        "name": "SEG5",
        "type": "output",
        "description": "LCD segment driver output 5."
      },
      {
        "number": "44",
        "name": "SEG4",
        "type": "output",
        "description": "LCD segment driver output 4."
      },
      {
        "number": "45",
        "name": "SEG3",
        "type": "output",
        "description": "LCD segment driver output 3."
      },
      {
        "number": "46",
        "name": "SEG2",
        "type": "output",
        "description": "LCD segment driver output 2."
      },
      {
        "number": "47",
        "name": "SEG1",
        "type": "output",
        "description": "LCD segment driver output 1."
      },
      {
        "number": "48",
        "name": "SEG0",
        "type": "output",
        "description": "LCD segment driver output 0."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/b23936df03793bbc58e03a9c4cff9dae.pdf",
        "pages": 19,
        "sha256": "38800fa307b08f96",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 48,
        "described": 48,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -4.1625,
        -2.75
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "LQFP-48_7x7mm_P0.5mm@sha256:1ccc5ad4d95398a4",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "ht1621bq.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          9,
          9,
          1.5
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "9dea352d93177c2904afd7d7b68ea8855ce1ab691f69f8b3e13655600514b6bf",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ht1621bq-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          9,
          9,
          1.5
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "0acbb4cb9b81ab0546ea360fc1235340adafebac8f7ef7adc2b5ac5a10b48187",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "HGSEMI",
      "Package": "LQFP-48(7x7)",
      "Category": "LED-drv",
      "Pins": "48"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ht1621bq"
  ],
  "discovery_pitch": "HT1621BQ (HGSEMI) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ht1621bq.kicad_sym",
    "ht1621bq.kicad_mod",
    "ht1621bq.glb",
    "ht1621bq.step",
    "ht1621bq.lbr",
    "docs/hero.png",
    "docs/ht1621bq-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "variants": [
    {
      "mpn": "HT1621BQQ",
      "kind": "packaging"
    },
    {
      "mpn": "HT1621BQ",
      "kind": "packaging"
    },
    {
      "mpn": "HT1621BQDQ",
      "kind": "packaging"
    },
    {
      "mpn": "HT1621BDQ",
      "kind": "unknown"
    },
    {
      "mpn": "HT1621BQM/TR",
      "kind": "packaging"
    },
    {
      "mpn": "HT1621BM/TR",
      "kind": "unknown"
    },
    {
      "mpn": "HT1621BQMS/TR",
      "kind": "packaging"
    },
    {
      "mpn": "HT1621BMS/TR",
      "kind": "unknown"
    },
    {
      "mpn": "HT1621BQDM/TR",
      "kind": "packaging"
    },
    {
      "mpn": "HT1621BDM/TR",
      "kind": "unknown"
    }
  ],
  "updated_at": "2026-09-24T22:00:12.574Z"
}